Process of producing oxygen compounds of tin.



UNITED STATES PATENT OFFICE.

CHARLES E. AGKER, OF NIAGARA FALLS, NEW YORK, ASSIGNOR TO ACKER PROCESS COMPANY, A CORPORATION OF NEW JERSEY.

PROCESS OF PRODUCING OXYGEN COMPOUNDS OF TIN.

Specification of Letters Patent.

Patented June 26, 1906.

Application filed June 22.1905. Serial No. 266,399.

To all ZU/l/OHZ/ it may concern.-

Be it known that I, CHARLES E. AoKER, a citizen of the United States, residing at Niagara Falls, in the county of Niagara and State of New York, have invented certain new and useful Improvements in Processes of Producing Oxygen Compounds of Tin, of which the following is a specification.

This invention is a method of making oxygen compounds of tin, more particularly stannic oxid. I

Heretofore tin oxid has been prepared by decomposing an alkali stannate by a suitable acid, by the action of nitric acid upon tin or upon a-lower oxid of tin, by precipitating stannic chlorid by means of an alkali hydrate or carbonate, and by roasting tin or a lower oXid thereof at high temperatures. I have now discovered that tin may be precipitated from its chlorid solutions as a hydrated oxid by the action of hypochloritessuch, for instance, as the hypochlorites of the alkali or the alkaline earth metalsand that such precipitation is accompanied by the liberation of chlorin in a state of substantial purity. This strong chlorin is a valuable by-product of my process and may be utilized in any desired manneras, for instance, for the production of chlorid of tin or of a hypochlorite or for pur oses for which dilute chlorin is unsuited.

ydrated stannic oxid is preci itated by hypochlorites from both stannic-c orid and stannouschlorid solutions; In the case of stannic chlorid the reaction may be expressed as follows:

If stannous chlorid be used,

liberated equivalent to that combined with the tin. I prefer to employ as the material from which the oxygen compound of tin is precipitated stannic chlorid, (SnUl because 'a given quantity of hypochlorite liberates therefrom agreater amount of the valuable by-product chlorin than from the stannous salt. As a precipitant I may employ calcium hypochlorite or bleaching-powder or the hypochlorites of magnesium, barium, sodium, potassium, or other alkali or alkaline earth metal.

I i I will now give an example of the pref rred manner of carrying out my process, it being understood, however, that the detailed procdure is given merely by way of example" the calcium hypochlorite may be added in the form of a dry powder or as a paste to the chlorid solution. The use of a clear solution of hy oohlorite from which the impurities have been removed by filtration ,or settling presents, however, the advantage of yielding a purer product. The solution is preferably agitated during the addition of the h ochlorite solution, and the chlorin,which is li erated in a state of substantial purity and free from air, is collected or utilized as desired. As soon as all the bleach liquor is added and a test shows that the preci itation of thetin is substantially complete t e small amount of free chlorin remaining dissolved in the liquor is expelled in whole or in part by blowing air through the mixture. diluted chlorin thus formed sho d not be permitted to mix with the pure chlorin pro.- duced during the precipitation. The h drated oxid of tin is permitted to settle, is

separated from the mother-liquor, washed free from soluble salts, dried, purified, and calcined in the usual manner. If stannous 'chlorid be used, the procedure is substantially as above described," but, as before stated, less chlorin is evolved.

This application is filed in lieu of forfeited renewal case, Serial No. 217,136, filed July 18, 1904, of original application, Serial No. 184,811, filed December 11,. 1903.

I claim 1. The herein-described method of produc The small uantity ofing oxygen Compounds of tin, which consists ing oxygen compounds of tin, which consists in reacting with a hypochlorite upon a chlorid of tin substantially as described.

2. The herein-described method ofproducing dioxid of tin, which consists in reacting with a hypochlorite upon a chlorid of tin,

vthereby precipitating the hydrated oxid of tin, and calcin ng said hydrated oxid, substantially as described.

3. The hereindescribed method of produc in reacting with a hypochlorite upon stamlic chlorid, substantially as described.

4. The herein-described method of producing oxygen compounds of tin, which consists in reacting with calcium hypochlorite upon a chlorid of tin, substantially as described.

5. The herein-described method of producing oxygen compounds of .tin, which consists in reacting with calcium hypochlorite upon stannic chlorid, substantially as described.

6. The herein-described method of producing oxygen compounds of tin, Whichconsists in reacting with a solution ofcalcium hypochlorite upon a chlorid of tin, substantially as described;

7. The herein-described method of producing oxygen compounds of tin, which consists in reacting with a solution of calcium hypochlorite upon stannic chlorid, substantially as described.

8. The herein-described method of producing oxygen compounds of tin and strong CHARLES E. ACKER.

Witnesses D. T. iViAGKAY, GERALDIN M. MCBRIDE. 

